Add note with link to Release Notes on homepage

Author: tdonohue

src/themes/dspace/app/home-page/home-news/home-news.component.html

@@ -4,6 +4,7 @@
       <div class="d-flex flex-wrap">
         <div>
           <h1 class="display-2">DSpace 9</h1>
+          <p><i class="fas fa-circle-info"></i> This site is running DSpace 9. For more information, see the <a href="https://wiki.lyrasis.org/display/DSDOC9x/Release+Notes">DSpace 9 Release Notes</a>.</p>
           <p class="lead">DSpace is the world leading open source repository platform that enables
             organisations to:</p>
         </div>